Allow dynamic switching in and out of sidetabs mode.

chrome/browser/views/tabs/side_tab_strip_model.h

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_VIEWS_TABS_SIDE_TAB_STRIP_MODEL_H_
 #define CHROME_BROWSER_VIEWS_TABS_SIDE_TAB_STRIP_MODEL_H_
 
 #include "base/string16.h"
 
+namespace gfx {
+class Point;
+}
 class SkBitmap;
 
 // A model interface implemented by an object that can provide information
 // about SideTabs in a SideTabStrip.
 class SideTabStripModel {
  public:
+  virtual ~SideTabStripModel() {}
+
   // Returns metadata about the tab at the specified index.
   virtual SkBitmap GetIcon(int index) const = 0;
   virtual string16 GetTitle(int index) const = 0;
   virtual bool IsSelected(int index) const = 0;
 
   // Different types of network activity for a tab. The NetworkState of a tab
   // may be used to alter the UI (e.g. show different kinds of loading
   // animations).
   enum NetworkState {
     NetworkState_None,    // no network activity.
     NetworkState_Waiting, // waiting for a connection.
     NetworkState_Loading  // connected, transferring data.
   };
 
   // Returns the NetworkState of the tab at the specified index.
   virtual NetworkState GetNetworkState(int index) const = 0;
 
   // Select the tab at the specified index in the model.
   virtual void SelectTab(int index) = 0;
 
   // Closes the tab at the specified index in the model.
   virtual void CloseTab(int index) = 0;
+
+  // Shows a context menu for the tab at the specified index at the specified
+  // point in screen coords.
+  virtual void ShowContextMenu(int index, const gfx::Point& p) = 0;
 };
 
 #endif  // CHROME_BROWSER_VIEWS_TABS_SIDE_TAB_STRIP_MODEL_H_